Picture reader

Abstract

Abstract PURPOSE:To coincide with the center of an original at the time of magnification and at the time of a variable power by reading a prescribed pattern and detecting the center of the original by means of a picture reading means. CONSTITUTION:An optical system is moved to a pattern position, and since a distance from the pattern position to an original tip position (the tip of an original area on an original loaded glass 4) is already known, the value is set as the travel of a scan motor. Next, both edges of a black-plastered pattern 16b of a pattern 16 are detected, and the center address of a CCD9 is calculated by both edge addresses. Next, the optical system is moved by the scan motor to the tip position of the original. Since the travel is known in advance, scanning can be started correctly from the tip position of the original at the time of the variable power. When the optical system reaches the tip position if the original, an effective picture signal is turned ON, and the picture reading by a CCD8 is started. Therefore, the center of the picture output is not dislocated when the same original is made from unmagnification to variable power.

Inventors

• 👤 Akio Nakajima
• 👤 Hiroshi Hasegawa

Bibliographic Details